Regulation for arc lamps



M. J. WOHL El AL REGULATION FOR ARC LAMPS Filed July 1921 My. m nzm Ja 5 Mat ovum Patented Oct. 20, 1925.

UNITED STATES PATENT OFFICE.

MAURICE J. WOHL, OF LONG ISLAND CITY. AND I-EAZL MAS.

on YORK, n. Y.,

ASSIGNORS TO M. J. WOHI; & CO. INC. 0): LONG ISLAND CITY, NEW YORK, A COR- PORATION OF NEW YORK.

REGULATION FOR ARC LAMPS.

Application filed July 25. 1921.

To a]? whom it may concern Be it kniwn that liIAUniUi-t 3. Your. a citizen of the United States, whose post-oti'ce address is Payntar Ave. and Hancock St eet. Long Island City. in the county of Queens and State of New York. and MAX Mann. a citizen oi. the United States. whose postotiice address is 311:) Manhattan Irvin. New York city, in the county and State of N w York, have invented certain new and usenzi Impruvements inRegulation for Arc Lamps, ot which the following is a specification.

This invention relates to improvements in the regulation of the light emission of clectric arc lamps and particularly to that type of such lamps which are used for photographic illumination and are provided with an autcmatic carbon-feed mechanism.

.In particular this invention constitutes an improvement of the "portable arc lamp for which an application for Letters Patent has been filed on January 17, 1921.. in the U. ti. Patent ()flice under Ser. Nov 437,957 by Maurice J. "0111, one of the inventors of the present improvement.

It is the object of the present inventim to provide simple means, to vary the lightstrength of the lamp instantly without thereby impairing the automatic ii'eeding action.

ith these and other objects in view, the invention consists in certain novel combinations of electrical devices and arrangements of parts hereinafter fully described and finally pointed out in the claims.

In the drawings which form a part of these specifications:

Fig. I is a sectional elevation of an arc lamp provided with the improvement, taken on the line II of Fig. II.

Fig. II is a plan view of the same lamp. A part of the top plate is broken away to show the mechanism.

Fig. III is a wiring diagram of the lamp emtmd'ying the improvement.

Similar characters of reference indicate corresponding parts throughout the various figures.

Fig. I and Fig. II show an arc lamp for which an application for U. S. Letters Patent, Ser. No. $7,987 is pending, this lamp is oi the duplex type in which two pairs of carbon electrodes 26-27 are arranged parallel to each other in the same reflector Serial No. 481270.

e l and the upper electrodes inserts encndently oi the mechanism iugl yes in plate 1. They are ch I Lies 25 which are oper- Ii) of solenoid ll, rod 17 .cl has its fulcrum at 21 and bar 23 to lift the y. Dash pot l lis suse 16 and its piston held 12. "he whole mecha- 233. bacl; of) and top and bottom plates 1 and The two pairs of electrodes are arranged ant he upper electrodes 26 connectct. to each other by a short flexible cable 2%). In he improved arrangement shown in III the connections are as follows: The terminals and 4:6 are formed by a reversible plug, consisting of female part L9 and male part at). The rornier is provided with tour tN JOI'tL'iI'OS of wh'ch 51 is connected .0 the ne e terminal of the line and jointly m n to the positive terminal. The pins of the male part 128, numbered 50*- but they are so piaced hat when either the top or bottom part of the plug is reversed horizontally, pin may enter 55 and 54- whiie in this case *2 will enter the dmnmy aperture 56.

The solenoid of the improved lamp is ovided with two separate windings 11 and ii IVhen the parts 48 and $9 of the plug are connected up as shown, current will flow from the positive line terminal 25 simul taneously through 555 l and 5S-52, both resistance coils 8 and 8*, both solenoid windii "s .11 and 11 to lower left carbon 27 i crn'iing an arc to 28 through cable 29 to 26 and forming a second arc to 27* from where it reaches through 50 and 51 the negative terminal Ii the plug should be reversed, so that pin 50 enters aperture 55 and 5l5l etc. it is evident that resistance 8 and solenoid winding ll are cut out of the circuit and its resistance doubled, while at the same time the polarity of the electrodes reversed.

This improved arrangement of the elec trical connections of the lamp provides an increased number of ampere-turns on the solenoid and an increased magnetization when the lamp operates with the higher amperage. It also provides simple means, remote from the lamp, to alter the light strength instantly without additional mechanism, as a plug of similar type is generally used to connect a portable lamp; the only addition is the third ole on the plu Attention is particu arly called to t e fact that the greater magnetization is provided for the hlgher amperage. The present invention was developed through experiments to provide means to avoid a certain sluggishness of regulation on the higher amperage. To use the same lamp for difierent amperages, it was customary to alter the resistance, it is novel however to alter the magnetization. This appears to be desirable for lamps provided with the sensitive mechanism described, to maintain arcs, the length of which is in proper roportion to the current passing throug the same. Doubling the current of an arc requires a longer are to obtain the proper light eflect whereby the resistance of the arc is increased, to compensate for the change in current thus produced the additional turns on the solenoid should be added. In a lamp using 12% amperes and provided with 240 turns about 60 additional turns should be added to provide proper magnetization for the longer are at 25 amperes when both re sistance coils are used in multiple. The invention results in an extremely stead light and sensitive feed under two wide y different current strenihis.

Having thus descri our invention, what we claim as new and desire to secure by Letters Patent is:

1. In an arc lamp a pair of arc forming electrodes, means for formin and regularing an arc of one of two di erent lengths and current values between said electrodes 45 consisting of a solenoid having two netizing windings, a resistance in series wi h each winding and switching means to pas current through one of said windingsfolm-f ing means to hold said are at a relatively 2" short length and low current value oralternatively to pass current through both wind ings in parallel to hold said are at a sub stantially increased length and larger cur-{f rent value. "I! 2. In an arc lamp the combination with, line terminals of a pair of electrodes, means i for selectively forming and regulati an are of one of two difi'erent lengths a intensities between said electrodes comprisingqfl a solenoid having two windings in with said arc, a air of resistances eacbin series with one of the windings of said Bob noid, and a switch provid' nect one winding and re both resistances and windings joine multiple to the same line terminal. v

3. In an arc lamp circuit the combination with a pair of arc forming electrodes of I means to mai -*2,

sai magnetic means comprising two magnetizing coils wound on a common core, a resistance in series with each coil; and common means to place alternatively one coil and its resistance or both coils and their resistances in parallel into said circuit. 4. In an arc lamp, the combination with a" ,V pair of are forming electrodes and automatic means for separating said electrodes including a solenoid, of two conductors constituting separate assisting windings on said solenoid, each winding being connected in series with a resistance, these series connec if tions being in parallel with each other and means to connect alternatively one or series connections in series with the arc.

MAURICE J. WOHL. MAX MAYER.

l w 4 sran-nnrnmrnim a,

nce sing ma etic means to separate said electrodeqtlfl 

